Aftermarket Tire and Wheel Help

All, I have a 2008 E4 and it has the stock wheels and tires. I want to change out but I know nothing about the GEM (1st time owner aka virgin). Have multiple sets of 205/50-10" 4 lug rims that I have had on Smokers and carts but I am not sure about the correct size that will work or the spacer issue. Any help would be appreciated, thanks

I am installing 195/60/14 tires and wheels this weekend on the same GEM. Search the forum there is lots of discussion around this topic - milage may vary with every install.